The definition that is always misconstrued with three levels of Love. Sounds to me that with different meanings and no commonsense it does not take brain surgeon to diagnose the convict here.
In my understanding, metaphors, and symbolism, there is no chance to distinguish between two loves: the purity and the selfish.
There was once a man with a coat of many colors who was stripped and cursed at, because they were jealous of their father loving him more than them. That was not until this man became a person whom they needed to depend on during a famine- still not sure how this boy- who became a man- would react to their needs back at home.
The is the parable of the prodigal son- sometimes we wonder how many times do we take what we want- and never remember what we need, but yet, when we begin to understand, one can come back and feel the presence of home instead of eating the food of pigs.
There is no precious story than the one to accept the Universal Love with understanding. How hard is it to realize the life of self deception and delusional thoughts, which keeps one under the curse of self depreciation- learn to understand that love is not only self, but that it is a Universal Love.